Jainosaurus is a genus of titanosaurian sauropod dinosaur of India and wider Asia, which lived in the Maastrichtian (approximately 68 million years ago).

[3] The specific name of J. septentrionalis means "northern" in Latin, a reference to the fact that the species was discovered on the Northern hemisphere whereas Antarctosaurus means "saurian from the Southern hemisphere" because its type species Antarctosaurus wichmannianus was found in Argentina.

The generic name honours the Indian paleontologist Sohan Lal Jain,[4] who worked on the cranial nerve impressions in the skull;[5] and in 1982 published a study about the results.

The postcrania, which had been assumed lost, were shown to be largely present in the collection of the Geological Survey of India at Calcutta.

It would have been a fairly derived member of the Titanosauria, more closely related to South American forms like Pitekunsaurus, Muyelensaurus and Antarctosaurus than to Isisaurus or Rapetosaurus.